Charles a



(No Model.)

0. A. PFLUGER. ELECTRIC ARC LAMP.

No. 531,698. Patented Jan. 1, 1895.

mj q m cmmti Ar'nuaifi ATTUWNFY UNITED STATES PATENT OFFICE.

CHARLES A. PFLUGER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE STANDARDELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 531,698, dated January1, 1895.

Application filed April 6, 189A. Serial No. 506,429. (No model.)

.To on whom it may concern:

Be it known that I, CHARLES A. PFLUeER, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Arc Lamps, of which thefollowing is a specification.

My invention relates to are lamps and has for its object the productionof an improved arc lamp, of which the following is a description.

Referring to the accompanying drawing, which is a diagrammatic View ofthe lamp, A is the base of the lamp to which the electromagnets areattached. The movable parts of the lamp are supported between standardsattached to said base, one of which A is shown. These standards are inelectrical connection with the base A, and are connected to the positivebinding post B, the connection to one of such standards of course beingsufficient. To the support A is attached a frame A Pivoted to the frameat the point A is the lever A to which is attached the core C of theshunt magnet C. Good electrical contact is obtained between the frame Aand lever A by the spring A. A dash pot C is attached to the end of saidlever A. To this lever A is attached the piece A adapted to electricallyconnect said lever with the stop A. Said stop is attached to the supportA, but insulated therefrom. Connected to this step A is the wire Aleading to the resistance coil A the other end of said coil beingconnected with the negative binding post B. A rod D connects the clutchD with the lever A, and is insulated therefrom at D This clutch isprovided with an arm D the end of which rests upon the insulating stripD A spring D connects the end of the arm D with the stationary piece DThe series magnet E is connected to the lower carbon and to the negativebinding post B. The armature E of the series magnet is pivoted at oneend, the other end being connected to the lever E by the rod E Saidlever E is pivoted to support A and is con nected to lever A by thespring E. The cur rent is conveyed to the carbon rod F by the brush Fwhich is electrically connected to the base A. This carbon rod F is soarranged that its motion will be stopped before the can bon holders cometogether, so that they will not be injured when the lamp is not trimmedor recarboned at the proper time.

It is evident that the various parts may be changed in construction,form and arrange ment without departing from the spirit of my invention,as I have only shown a diagrammatic view in order to simplify thedrawing, and I therefore do not wish to be limited to the constructionshown.

The use and operation of my invention are as follows:

When the lamp is in operation the main circuit is traced as follows:from binding post B to support A, thence to base A, thence to brush Fand carbon rod F, thence through carbons, thence through series magnet Eand thence to binding post B.

The shunt circuit is as follows: from base A through shunt magnet C andthence to binding post B.

As shown in the drawing, no current is flowing through the lamp. If nowthe cir cuit through the lamp is completed, the se ries magnet Ebecoming energized attracts its armature E and by means of the rod Erocks the lever E on its pivot. Then this occurs the lever A is movedupward by means of the spring E and the connection between the piece Aand stop A is broken. Since the clutch D is connected to said lever A bythe rod D, said clutch will be moved upwardly carrying with it thecarbon rod F and thus separating the carbons. As the carbons areseparated some of the current is directed through the shunt coil C, andwhen the arc becomes too large the shunt magnet, pulling down on thecore C, lowers the lever A and hence clutch D by means of rod D, andfeeds the carbons together.

During the normal operation of the lamp the armature E of the seriesmagnet remains stationary in its attracted position, and hence 9 5 thelever E is not moved. The spring E allows a movement of the lever Awithout any movement of the lever E and draws the said lever A back toits normal position so that the clutch holds the carbon rod, after thecarbon has been fed enough to reduce the strength of the current in theshunt magnet.

IOO

It Will thus be seen that the series magnet only strikes the arc, whilethe shunt magnet does the feeding. If for any reason the carbon fails tofeed, the current in shunt magnet Okeeps increasing until the lever A ispulled downwardly so that the piece A comes in contact with the stop A.When this occurs the current is shunted around the carbons and seriesmagnet, and through the resistance A and the lamp is cutout of circuitwithout breaking the circuit through the remaining lamps. The resistanceA in this shunted circuit is necessary to make the resistance throughsaid shunted circuit sutlioient to force the current through the seriesmagnet when the carbons are together, in order that the lamp may bestarted.

The regulating mechanism is mounted upon a single base or plate, thuspreventing the displacement of the parts.

I claim 1. In an arc1amp,the combination of a main circuit magnet orsolenoid, ashunt magnet or solenoid, a lever for the latter, a system oflevers associated with the main circuit magnet, a spring connecting suchlast system with the shunt magnet lever so that the latter is lifted andelastically suspended by the action of the main circuit magnet, a clutchfor the carbon rod and a connection therefrom to the shunt magnet lever.

2. The combination in an arc lamp of a shunt and series coil, a pivotedlever controlled by the series coil, a second pivoted lever controlledby the shunt coil, and an elastic connection between the two lovers, aclutch associated with one of the carbons of the lamp and connected tothe lever controlled by the shunt coil, whereby said clutch is movedonly by the movement of the shunt coil lever.

3. In an arclamp, the combination ofa main circuit magnet orsolenoid,ashunt magnet or solenoid, a lever for the latter, a system of leversassociated with the main circuit magnet, a spring connecting such lastsystem with the shunt magnet lever so that the lat ter'is lifted andelastically suspended by the action of the main circuit magnet, a clutchfor the carbon rod and a connection therefrom to the shunt magnet lever,and a stop associated with the shunt coil lever by which a circuit iscompleted around the series magnet when the carbons are too far apart.

CHARLES A. PFLUGER.

Witnesses:

WALTER J. GUNTHORP, FRANCIS W. PARKER.

